Tuesday, April 26, 2016

Setting Master/Slave on the Canon 580EXII

I always forget how to do this so I'm blogging about it so I know right where to look and so maybe it helps one other person. 1. Press and hold zoom for about 3 seconds to get into the master/slave mode. 2. Rotate the wheel to select between "off", "master on" or "slave on". 3. Press the set button. Don't forget the set button. Happy multiple flash photography!

Thursday, April 21, 2016

Lulzbot Taz 5

I got one. I decided to not wait for the Taz 6 for two reasons. It's about 6 months out and a friend has a Taz 5 so we can make tweaks together and support one another. And I have some stuff I wanted to print. Plus Lulzbot, and the community, supports their old printers so well I don't think it'll be out of date any time soon. Some recommendations for first time owners of a 3D printer and specifically a Taz 5. 1. Throw away the knife tool and buy a paint spatula like this: I bought a Liquitex free style. It was about $12 at the local art supply store. The key things you are looking for is the angle holding the spatula part so you can get the spatula flat on the bed without your hand interfering. You also want it to be fairly sharp but strong. This one has variable thicknesses for each protrusion on the spatula. 2. I changed the factory settings on the printer. The factory settings are: Vmax-x: 800 Vmax-y: 800 Vmax-z: 8 Amax-x: 9000 Amax-y: 9000 Amax-e: 10000 Aretract: 3000 I changed these to the following: Configuration->Advanced Vmax-x: 192 Vmax-y: 208 Vmax-z: 3 Amax-x: 2000 Amax-y: 2000 Amax-e: 400 Aretract: 2000 Make sure to store the settings. -> Store Settings 3. The Cura settings change depending on the filament. I've been having great experience with Verbatim 3mm filament using the following settings: Basic: Layer height: .15 Shell thickness: 1 Enable retraction: true Bottom/Top thickness: 1 Fill Density %: 20 Perimeters before Infill: true Print speed: 60 Printing temperature: 0 Bed temperature: 0 Diamter: 2.85 Flow: 100 Advanced: Nozzle size: .5 Speed: 10 Distance: 4 Initial layer thickness: .15 Initial layer line width: 100 Cut off object bottom: 0.0 Travel speed: 100 Bottom layer speed: 30 Infill speed: 75 Top/bottom speed: 40 Outer shell speed: 40 Inner shell speed: 60 Minimal layer time: 5 Enable cooling fan: true The reason I set the temperatures to zero is I turn them on on the printer itself first. This allows gcode to print PLA or ABS. However, the other settings need to match as well. This doesn't work when switching between other brands of filaments that need different settings. For instance IC3D filament is 2.9mm rather than the standard 3mm filament of 2.85 (yeah, that doesn't make sense). However, IC3D filament has been impossible to print with. I had an impossible time on the Type A Machine Series 1 as well. Same problems actually. IC3D filament requires 115 degrees and a slightly hotter bed of 70 degrees, while Verbatim is 105/60. But the IC3D is so chalky if there is any retraction the filament stepper eats through the filament resulting in a failed print. Verbatim is a little more difficult to get though since Amazon won't ship it to me. It's an Amazon bug that we've been going back and forth on for some time. eSun is also good filament. A bit more stringy though.

Tuesday, March 15, 2016

Bash Script to get Path to Inself

I use bash enough and fumble my way through it that I have little nuggets like this but I never retain them in my brain. So, in contributing to the global bash community and my external brain storage, here is how to get the path that your currently running script lives in.

PATH=$(cd $(dirname $0) ; pwd -P)
And since people typically post scripts like this, even one liners, and don't explain them, I'll explain each piece. 1. The first argument is the full file name to the script: $0 2. Get the directory of the script. You'd think we'd stop there, but we keep going: $(dirname $0) 3. Change directories to the directory containing the script: cd $(dirname $0) 4. Run another bash command: ; 5. Get the current working directory, and -P resolves symlinks: pwd -P 6. Assign the directory containing the script and that is not a symlink so the real path to the PATH variable: PATH=$(cd $(dirname $0) ; pwd -P) There you have it!

Tuesday, March 1, 2016

External Hard Disk Doesn't Eject On El Capitan


Ever since upgrading to El Capitan all external hard disks won't eject because Spotlight is always running. I have to stop Spotlight with this command before ejecting or risk corrupting the hard disk:


sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist

And then restart Spotlight:

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist

Tuesday, January 26, 2016

Alternative iPhone Music App


The stock iPhone Music app has been getting worse and worse. I finally gave up and searched around for a better music app and have settled (for now) on an app called Ecoute. Ecoute is pretty simple. There isn't much there besides an app to play your music. You can easily create playlists on the fly and it just works where the iPhone Music app really doesn't. If you find the iPhone Music app cumbersome, you don't want to subscribe to Apple Music then give Ecoute a try. Sure it's $1.99 but just works. It's what a music app should be!

Thursday, January 14, 2016

CAD Applications for 3D Printing

By far the biggest limiting factor in 3D printing is easy to use CAD software. Here is a list of the best CAD software applications that I've found.


Sketchup - Great for woodworking, but unusable for 3D printing since it only is good down to 1/16 of an inch.

Solidworks - By far the best software package out there. Very expensive out out of the reach of the average person. The student version is $100, the regular version is $4000 with a $1500 yearly license but the one you really want if you want to build assemblies is the $8000 version with a $2000 yearly license. You don't actually own the software and it's more like buying a car than buying software since you have to go through a sales guy that deeply discounts the price at the end of the year, but if you are making money on what you're building then this is the software you want.

AutoDesk - I see people get amazing results from this. I'm not one of them since there are some serious bugs on the Mac. For some reason the model will just disappear in the middle of working with it. I also can't stand the fact that all saved files are in the cloud.

FreeCAD - This is an open source totally free CAD package that is rather good. I doesn't work on the Mac at all. They have a version but don't bother, it's way too old. Lulzbot uses FreeCAD exclusively supporting their open source tradition. If you have Windows or Linux, this is a pretty good package!

OpenSCAD - Like FreeCAD it's open source but it's different than all the other CAD programs out there. At first I was put off by how it works but I now appreciate it. You program everything. This is cumbersome for large models, but actually it works pretty good once you get used to it. My only complaint which has been solved openjscad.org is that you can't anchor an object to a point on another object and have it's world view relative to that point. Rather everything is translated from 0, 0, 0. If they fixed that one problem this would be a much more powerful and competitive product. But I love the parametric functionality and for some things this is what I've been using. Also you can send someone a file in email without an attachment!

ViaCAD - I've settled on ViaCAD. They have some inexpensive options and a lot of features. It makes a lot more sense to me than AutoDesk and I can save files locally and it works on Mac!

Monday, January 11, 2016

3D Printers Part II

A few weeks back I posted about my experience researching 3D Printers and in depth details about my purchase of one specific printer here. Over the Holliday break I had the fortune of bringing home the school's Pegasus printer to calibrate and I have worked with my friend's Taz 5 a lot more and I have changed my mind. I have decided to wait for the Taz 6. It should be out in a few months and it improves a many things over the Taz 5.

The Pegasus overall is an inexpensive printer kit and you get what you pay for. I made a lot of custom parts and modifications. If I get a chance I'll post the STLs of the printed mod parts. The good about the Pegasus is it is inexpensive and a good first step into 3D printing and it will give you a lot of experience. I also really like where the filament roller is. Don't get frustrated though, because it has some down sides that don't happen with all good printers. First, it takes a lot to get it calibrated. Making sure all 3 axis are perpendicular is tough for any printer, but since the parts in the Pegasus are on the lower end to save money there are a few other problems. The stepper motors overheat and when they overheat the print head can end up anywhere. The software must have a firmware update because some things just don't work. I don't like the digital calibrate and the bed screws make it difficult to manually calibrate the bed. Calibrating the X axis is very difficult. The changes I made are to add a bowden tube to prevent any feed problems. I modified the filament holder roller mechanism. I printed out some open beam wire clips. I made a system to level the bed with a class clip and a hand twist nut head. And the Z stepper motor lead screws have a cap on them so you don't accidentally hit them or bend them. That's the short list. There's a few other changes.

The Taz 5 has an X calibration issue that the Taz 6 should fix with a number of other worthwhile changes to an otherwise very solid machine. I like the all-in-one electronics box on the left size. You can see the parts lists, STL files and photos of the TAZ 6 here.




Wednesday, January 6, 2016

Cookies notification in European Union countries

Apparently there's some law in the European Union that requires me (the blogger) to inform you (the blog reader) if I use cookies and if so what I do with them. I do not use cookies. I only publish little tidbits of information and interesting things I find interesting and useful. But this blog is hosted by Blogger which is owned by Google, and Google does use cookies. Here is what Google does with your cookies. I also have Amazon ads on this blog. However I need to find some time to remove them as I haven't been receiving any money due to something I forgot to read or do. I don't know what their link to using cookies is but I'm sure they do just as much as Google. There's also some map thing on the sidebar that I'm sure uses cookies and sells your information. And in the future I may add other widgets that use cookies. Rest assured if you are viewing this blog with a web browser someone somewhere is using a cookie and storing it in Big Data. If they aren't then your ISP is harvesting your data and tracking what you do. If they aren't then some government somewhere is and they also know what kind of underwear you buy. There is also a small chance that some hacker community out there is storing your data. I like to call these bad hackers Bad Data. So rest assured none of this is happening by me. All I do is look at the pretty graphics that Google provides to see if anyone in the world read this blog.

If you want to know how to delete your cookies click here. If you want to disable cookies in which the entire internet stops working click here. No it really doesn't stop working but they will bug you into turning them back on! So instead, browse in incognito mode by going here.

Tuesday, December 22, 2015

Convert .a png to .icns for Mac App Bundle

Here is a bash script to convert a .png to .icns for Mac App Bundle. Usage:

pngtoicns.sh image.png AppImage

and it will generate AppImage.icns

#!/bin/bash

INFILE=$1
OUTFILE=$2

mkdir $OUTFILE.iconset
sips -z 16 16     $INFILE --out $OUTFILE.iconset/icon_16x16.png
sips -z 32 32     $INFILE --out $OUTFILE.iconset/icon_16x16@2x.png
sips -z 32 32     $INFILE --out $OUTFILE.iconset/icon_32x32.png
sips -z 64 64     $INFILE --out $OUTFILE.iconset/icon_32x32@2x.png
sips -z 128 128   $INFILE --out $OUTFILE.iconset/icon_128x128.png
sips -z 256 256   $INFILE --out $OUTFILE.iconset/icon_128x128@2x.png
sips -z 256 256   $INFILE --out $OUTFILE.iconset/icon_256x256.png
sips -z 512 512   $INFILE --out $OUTFILE.iconset/icon_256x256@2x.png
sips -z 512 512   $INFILE --out $OUTFILE.iconset/icon_512x512.png
cp $INFILE $OUTFILE.iconset/icon_512x512@2x.png
iconutil -c icns $OUTFILE.iconset
rm -R $OUTFILE.iconset

Thursday, December 17, 2015

3D Printers

I've been doing a fair bit of 3D printing lately which has kept me busy and is why this blog hasn't been updated in some time. But I'm now at a point where I'm going to start talking a bit about 3D printers and my experience. It's a big industry and growing rapidly so it takes a bit to get your head wrapped around it.

Most of my experience comes from using friend's printers, but nothing comes even close to being thrown into the deep end and having to use one all by yourself. I originally wrote this post going over my decision making process, but I actually purchased a printer and it was defective so I went back and rewrite this post including my new decision making process for my second 3D printer including some of my hands on experience with that printer. At work we also have a few different machines. So I researched just about everything else out there but mostly the Ultimaker 2, Zortrax M200, Lulzbot Taz 5, Type A Machine Series 1 and Fusion3 F306 as well as a few dozen others. My budget was no more than $3000. I wanted to get a good printer and not one that I'd want to replace in a year.

Every 3D printer design has tradeoffs, and reviews are only half the equation. So here's what I've found and what I decided to go with. The things I decided to look for are:

1. The ability to level the build plate.
2. Heated plate.
3. Simplicity of the extruder. Some are very complex and not easy to clean if filament gets stuck (and it will get stuck).
4. Print speed (this is extremely tricky and has many tradeoffs including resonance).
5. 3mm filament instead of the more popular 1.75mm (this is a new requirement since my returning of the printer I originally purchased).

I decided against the PrinterBot because it's just too small and the quality of prints I've seen come off it aren't up to what the other printers produce. But I do like the design and price! It is a very solid printer. You really can't go wrong with this printer if the size is big enough for what you want to print.

The Zortrax M200 seems to be the world's best kept secret it seems. It's half Ultimaker 2 and half Type A Machines Series 1. The stepper motor for the filament lives on the print head so technically it's a little slower to print but as I wrote earlier about the Ultimaker 2 I prefer this design given the tradeoffs. The problem with the Zortrax is I just don't know enough about it because it is the world's best kept secret.

The Ultimaker 2, which is what I have the most experience with, while a good printer it has some serious flaws that only show up after using it for some time. No review will find these. The print head moves in X and Y while the build plate moves down Z as the print is assembled. To increase print speed the Ultimaker 2 reduces the weight of the print head by moving the stepper motor that moves the filament off the print head and onto the frame by using a Bowden tube and using the filament from the roll to the print head. The Bowden tube is made of teflon which is slippery and has a higher melting temperature than the filament which is good because when the filament gets stuck you can simply get a blowtorch, stick some new filament in the tube melt the stuck piece and pull it out. Don't cut the tube like others have done because you'll just have to buy a new $30 Bowden tube. So while this is a slick way to make the print head go faster (less mass means easier to throw the print head around at faster speeds), it has the side effect of requiring 3mm filament which I used to not like but now I prefer. But there is another side effect. The print bed is cantilevered and isn't super solid so when it goes down fast it oscillates making the print not come out so good.  The only way to counteract this is to print slower. So what's the point of the print head being able to go faster? Well there are a couple reasons, balance of the print head is key. Without an a stepper on the print head the center of mass is easy to get accurate and right over the extruder tip. The Ultimaker 2 has a screen and an SD card but no wireless printing or USB to be connected to a computer. The SD card is nice because I'd prefer not to be tied to having a computer drive it, but requires a screen so originally I didn't care about the screen and thought it'd be good to have wireless printing but I've now found that you need to have a computer right next to the printer if you don't have the ability to start prints from the printer itself. Actually mainly for diagnosing problems and to extrude small bits of filament when swapping filament or cleaning the print head. The build platform is 8in x 8in x 8in which is fairly big but not huge but pretty standard. The Ultimaker 2 is a bit difficult to work on, but it is a pretty good printer overall.

The Lulzbot Taz 5 was actually my runner up choice but was not my first choice. The sales rep at a Santa Clara 3D printer show was right. He said "sure, you can go with a different brand, but you'll eventually be back looking at the Taz". He was right. The build plate moves in the Y direction while the print head moves in the X and Z. But the build plate is heavy and as the print gets larger it gets heavier. Common sense says this large amount of mass takes a lot of work to move and if it isn't quite dry the print can move. Just a slight move will cause an uneven print. The only way to counteract this is to print slower. Other than that I think the Taz 5 is a great machine and like I said was my runner up. I like that it's open source and has a huge community around it. It's print volume is a little bigger than the Ultimaker 2 at 11.7in x 10.8in x 9.8in. Very odd size. A friend of mine was in the market for a 3D printer so I shared my thoughts and he decided to go with a Taz 5 and has been printing right out of the box without any problems. There is a slight issue with the weight of the print head and when the print head is at X = MaxX / 2, the print head moves about 100 microns about (1 layer or half a layer depending on layer resolution). It isn't a huge problem, but I think it's the biggest issue I have with the Taz 5 at this point. There are a few solutions, wait until the Taz 6, they are putting larger rods on the X axis, and there are a few solutions users have published (http://www.thingiverse.com/thing:866604). One thing I really like about the Taz 5 is it uses a 24volt power supply. That means the print head heats up fast! They also use very high gauge wires to the print head which is important.

Type A Machine Series 1 Pro is what I decided to get, and unfortunately had to returned it. It prints the biggest of all these at 12in x 12in x 12in, and all the specs look great. At first I thought the cantilevered print bed would be a problem but it's super solid. The printer has wifi and a web server instead of an SD card and display. However, my experience of actually using the printer for two weeks changed my opinion and I would only buy a printer for my needs if it has a display, SD card and controls on the printer. I'll elaborate more on this later. I visited their facility since it's near Oakland and only an hours drive away. First off, they are super nice, but I will tell my store exactly how it happened. I spoke with Type A Machines and they had a two or more month waiting list. Alternatively they had a refurbished unit that I could get right away. I really wanted it sooner than later because of my daughter's Maker's Club and a few projects I'm working on so I went against my better judgement and got it. I never buy refurbished and I never will again. The $500 savings tipped my decision from the Taz 5, brought the price under my budget, and the larger build volume was important for one thing I wanted to print and I really didn't like at the time how the Taz bed moves. It's all engineering compromises but now after working with the Type A I prefer the Taz design. So, the printer shows up, I open it up and there are no directions besides this way up sign and don't grab here. At this point there should be directions right on top for what to do and I think they'll fix this but I had no directions, so I cut the box and slid the printer out. It was well packaged but wasn't difficult to get it out of the foam protection armor. I set it up, opened up the box on the side with the build plate but had no instructions, power cord or wifi antenna. I looked around on the website for instructions but couldn't find any. The wifi antenna and power cord were in another box but under the print bed wedged in. I finally figured out that I had to manually twist a knob on the back to raise the print bed to get the box out. After opening this new box and finding no directions I dug around and finally found them. The instructions turned out where shoved down the size of the box. I skimmed through the instructions to figure out how to connect to the printer since I had already set it up. And here's where things went really south but I'll just point out the highlights so this isn't a 10 page post. I had no filament. The filament I ordered from Type A didn't ship. They did a next day air but it arrived 2 days after the print. A friend however had some 1.75mm ABS, so I did a quick level of the bed and went to print. My workflow is to have my computer inside the house and the 3D printer in the garage. I could bring my laptop out to the garage but that's less than ideal. I ended up using my iPad, but the web browser interface is extremely clunky with the iPad. In order to use this printer you need a computer right next to it. This is why I prefer the SD card design. Having to require a computer is either handy if you want the printer sitting on your desk but if you want it in the garage or somewhere the order from the melted plastic won't bother everyone in the house then you need another computer adding to the expense of the device. So the prints were turning out really odd. The print head would never go to X = 0. I'd have to restart the printer, physically move the print head and turn it back on. About a 10 minute procedure. Also the loading of the model on the iPad took forever, but I couldn't start a print from my computer because you need to be right next to the printer and even more so for me since all the problems I had. I also found out that that the filament would get tangled up. To make a long story short, there was a Bowden tube in the box but because of my problems with the directions I never noticed it. I saw it but thought it was a small piece of sample filament. Also, all the photos of the printer on the website or manual do not have this Bowden tube attached. There's one little sentence in the directions buried in a long paragraph that describes it. I ended up getting my own Bowden tube to avoid the tanglement but it still has major problems because of the range of motion of the print head, 12" in both X and Y and it can move fast! I ended up giving up on the ABS since it stinks! So in addition to the print head not returning to X = 0, turned out there was dust and hair in all the fans that started blowing out on my earlier prints, one of the belts was worn, the two rail slides were rusted and the L bracket holding the fan was bent. Not so refurbished like new up to the most recent spec of the Series 1 2015 model as they claimed. Turned out the rusted rail slides had been replaced in newer units with a stainless steel version but mine didn't get that fix. I also ran into some sort of head clog after very little printing that I could never figure out and Type A Machines tried but after 20 minutes gave up and blamed it on the fact that I ran about 12" of ABS through the printer which apparently isn't supported contrary to all the specs supporting it and verbal approval from multiple people on my visit saying it can print ABS. I guess it isn't in their "supported" filament list and "voids the warranty". It extruded fine for 2 days after the use of ABS so I don't think that was the problem. To finish up the story, I personally delivered the printer to Type A, returned it, and spent over an hour going over all the problems that I had. Eventually 6 days later of going back and forth I got a refund since that is their policy (good policy and good to know they honor it), but since it wasn't my fault but a faulty unit I requested a refund of the unused filament and the shipping that I paid to get the printer. It was a bit of a hassle to be honest but they did honor everything. Last thought is I know the Type A uses a 24volt power supply, but the print head doesn't heat up as fast as the Taz 5. I think this is due to the ribbon cable they use to supply power and data to the print head stepper. I don't see how the tiny wires in the ribbon cable can support enough amps to heat the print head up. There'd be a lot of waste in the ribbon cable at any rate.

So, I prefer 3mm filament because it has more pressure and doesn't tangle as easily. I prefer the print bed to move in the Y direction rather than the Z so the movement of the print head is simpler. I prefer the open model of the Taz because if something doesn't work you can modify it. I'm ordering a Taz 5 and plan to upgrade or modify the X axis to the Taz 6 version or some other modification at some point. I also plan to build a housing for the printer so it doesn't smell.

Last thought, the Type A Series 1 has a very small footprint but is very tall. The Taz 5 isn't as tall but has a much larger footprint because the bed moves.

Wednesday, December 16, 2015

How to Stop Your Cursor from Getting Bigger in OS X El Capitan

Ever since installing El Capitan I've noticed the mouse cursor getting bigger once in a while. It thought it was a bug at first but, it isn't. This article will show you how to turn it off:

http://www.tekrevue.com/tip/cursor-bigger-shake-to-locate-el-capitan/

Thursday, November 5, 2015

How to Move Your iTunes library to an External Drive

iTunes can take a lot of hard drive space, especially for a laptop with an SSD. But if you get an external drive, you can move your iTunes library to the external drive.

1. Copy the entire iTunes folder (~/Music/iTunes) (and all its subfolders and files) to the other drive.
2. Open iTunes while hold down the Option (alt) key (shift on Windows).
3. A dialog will show up, click "Choose Library..." and selected the iTunes folder you copied to the other drive.